t85.c
--

#define F_CPU 1000000UL

#include <avr/io.h>
#include <util/delay.h>


void delay_ms(uint16_t count) {
	while(count--) {
		_delay_ms(1);
	}
}

int main(void)
{

	DDRB |= (1<<PB4);	/* PORTB output 0b00010000 */

	while (1)
	{
		PORTB ^= (1<<PB4);
		delay_ms(500);
	}
}




######################################


make output
---

pi@tumor:~/t85 $ make

-------- begin --------
avr-gcc (GCC) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Compiling C: t85.c
avr-gcc -c -mmcu=attiny85 -I. -gdwarf-2 -DF_CPU=1000000UL -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=./t85.lst  -std=gnu99 -MMD -MP -MF .dep/t85.o.d t85.c -o t85.o

Linking: t85.elf
avr-gcc -mmcu=attiny85 -I. -gdwarf-2 -DF_CPU=1000000UL -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=t85.o  -std=gnu99 -MMD -MP -MF .dep/t85.elf.d t85.o --output t85.elf -Wl,-Map=t85.map,--cref     -lm

Creating load file for Flash: t85.hex
avr-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature t85.elf t85.hex

Creating load file for EEPROM: t85.eep
avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" \
--change-section-lma .eeprom=0 --no-change-warnings -O ihex t85.elf t85.eep || exit 0

Creating Extended Listing: t85.lss
avr-objdump -h -S -z t85.elf > t85.lss

Creating Symbol Table: t85.sym
avr-nm -n t85.elf > t85.sym

Size after:
AVR Memory Usage
----------------
Device: attiny85

Program:      92 bytes (1.1% Full)
(.text + .data + .bootloader)

Data:          0 bytes (0.0% Full)
(.data + .bss + .noinit)